Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1edc0dc3082cadb…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 12:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0eec6a4ecb5fe87fedb0a3ef72621495 SHA-1: 3b3ef2a73d12c7b06208af7dae97fe04015312f4 SHA-256: a1edc0dc3082cadb3f9c335058086d78adf6b50f4ee425192b40cc777e150d6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a spearphishing campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=in+the+afterlight+pdf+free+download PDF link annotation
    • https://bluetact.com/ckfinder/userfiles/files/60643804734.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/motuwe.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/56937875107.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/zadejotozosigalidivupudu.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109200648394896.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20211001165918.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/moloku.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/53765758296.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/9038101460.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/65909896791.pdfIn PDF document text
    • http://totoumi.jp/upload/file/44273815817.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/vobisetenopojosiriz.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/bimuzugojujidituv.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/falasijubaz.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/55009635634.pdfIn PDF document text
    • http://www.moyekolodin.com/files/10114301506.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/13069552028.pdfIn PDF document text
    • http://protok.pro/upload/files/3757530847.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vidifigosoxefalowu.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/dowusa.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/84865901908.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/17424521204.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC02 10644 bytes
SHA-256: 8df8d35f23139bbd4f33df4e6b05f01bd18ea4e7ed8c0d2696b6e48c67851a65
font_01_sfnt_off0000c410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC410 15912 bytes
SHA-256: dce194d3e329573d0e97066dab8efb10d0273592fd7f710d67eb06882dc007bb
font_02_sfnt_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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